the giveaway threads are posted in games and rounds board but the sticky there says that if your payment is in altcoins you have to post it in Bounties (Altcoins) board[3].
[1] https://bitcointalk.org/index.php?board=71.0
[2] https://bitcointalk.org/index.php?topic=5341846.0
[3] https://bitcointalk.org/index.php?board=238.0